Answer :
the guests that chose the beef and chicken are 1/3+5/12=4/12+5/12=9/12
that leaves 3/12 guests that chose vegetarian food (stupid vegans)
3/12------->23
12/12----->X
X=[(23×1)/(3/12)]
X=92
there was 92 guest in total
that leaves 3/12 guests that chose vegetarian food (stupid vegans)
3/12------->23
12/12----->X
X=[(23×1)/(3/12)]
X=92
there was 92 guest in total